Development and purchase of cold storage insulation board
Release time:
2021-02-09
For cold storage insulation board materials, our primary requirement is its thermal insulation performance. These thermal insulation properties cannot be recognized by our own eyes, so we must choose thermal insulation materials produced by regular manufacturers. These manufacturers have strict quality control in material selection and production.
The development of cold storage insulation board material:
Rice husk: Rice husk is a loose thermal insulation material with low price and wide source. Dry rice husk has good thermal insulation performance. In the 1970 s and 1980 s, rice husk was still used as thermal insulation material for the outer wall of domestic cold storage rooms, the floor of roof pavilion and the vast majority of thermal insulation walls of cold storage rooms. However, rice hulls are highly hygroscopic, susceptible to moth-eating, and have a large sedimentation over time. Therefore, they must be protected from moisture, moths, and timely inspection, replenishment or replacement. They are currently being phased out.
Cork board: Cork board is a good block heat insulation material, which has the advantages of low thermal conductivity and high compressive strength. However, due to low output, high price and inconvenient construction, it is usually used for floor insulation in refrigerating rooms, partition walls of freezing rooms, "cold bridge" parts of structural components, and parts frequently used in freeze-thaw cycles. The cork board is made of cork oak bark. Due to different weights, different densities, different carbonization degrees, and different particle size classifications, the quality of carbonized cork boards produced in different places is also very different, and attention must be paid to selection.
Expanded perlite: Expanded perlite is a white porous granular material that can be used to directly fill the outer wall of a cold storage or the roof sandwich floor. It can also be cemented into products of various shapes, such as cement expansive agents. Perlite or bituminous expanded perlite. The material has low thermal conductivity and high compressive strength. However, expanded perlite has a large water absorption rate, and the water absorption rate is fast, which will lead to poor results. It should be used with caution as refrigerated insulation.
Polyurethane insulation board: This material has the advantages of light weight, good insulation performance and low temperature resistance. However, its water absorption rate is large, and there is a phenomenon of cold shrinkage. Adhesives must be used for cutting and pasting during construction. If petroleum asphalt is used, the temperature of the asphalt must be strictly controlled. If the temperature is too low, the viscosity will not be firm. If the temperature is too high, the foam will melt. The material used for cold storage and insulation also requires the product to be self-extinguishing to meet the flame retardant requirements of small houses.
purchase of cold storage insulation board:
For cold storage insulation board materials, our primary requirement is its thermal insulation performance. These thermal insulation properties cannot be recognized by our own eyes, so we must choose thermal insulation materials produced by regular manufacturers. These manufacturers have strict quality control in material selection and production.
When the temperature changes sharply or at lower temperatures for a long time, the polyurethane foam material in the cold storage will undergo dimensional changes (usually shrinkage). Dimensional changes are manifested as foam bursting or falling off, which will inevitably affect the normal use of the refrigerator compartment.
In addition to the basic performance of the cold storage insulation board, its service life is also very important. When they are used to prepare white materials, although the foam used on the surface of these polyester materials has good toughness and impact resistance, after a period of use in cold storage, it will become very brittle, which will reduce the life of the insulation board. Therefore, although it is slightly brittle at the beginning, it usually disappears after a few days, and then maintains the stable performance of the cold storage insulation board for a long time.
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